Renesas SH7781 User Manual
Page 399
11. Local Bus State Controller (LBSC)
Rev.1.00 Jan. 10, 2008 Page 369 of 1658
REJ09B0261-0100
Bit Bit
Name
Initial
Value
R/W Description
19, 18
⎯ All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.
17 BREQEN
0 R/W
BREQ Enable
Specifies whether an external request can be accepted
or not. In the initialized state at a power-on reset, an
external request is not accepted. When this LSI is
booted up in slave mode, an external request is
accepted regardless of the BREQEN value.
0: An external request is not accepted
1: An external request is accepted
16
DMABST
0
R/W
DMAC Burst Mode Transfer Priority Setting
Specifies the priority of burst mode transfers by DMA
channels 0 to 5. When this bit is cleared to 0, the
priority is as follows: bus release, DMAC (burst mode),
CPU, DMAC, PCIC. When this bit is set to 1, the bus is
not released until completion of the DMAC burst
transfer. This bit is initialized at a power-on reset.
0: DMAC burst mode transfer priority setting is off
1: DMAC burst mode transfer priority setting is on
15
⎯ 0
R
Reserved
This bit is always read as 0. The write value should
always be 0.
14 HIZCNT
0 R/W
High
Impedance (Hi-Z) Control
Specifies the state of signals
WEn and RD/FRAME in
the bus-released state.
0: Signals
WEn and RD/FRAME are high-impedance in
the bus-released state
1: Signals
WEn and RD/FRAME are driven in the bus-
released state
13 to 7
⎯ All
0
R
Reserved
These bits are always read as 0. The write value should
always be 0.